Dash-pot mechanism.



H. P. MYERS.

DASH POT MEOIIANIBM.

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902,989. Patented Nov. s, 190s.

EW? TNESSES l J.

HENRY F. MYERS, OF HUTCHINSON, KANSAS.

DASH-POT MECHANISM.

Specification of Letters Patent.

Application led June 20, 1908.

Patented Nov. 3, 1908.

Serial No. 439,558.

To all whom it may concern:

Be it known that I, HENRY F. MYERS, of Hutchinson, in the county of Reno and State of Kansas, have invented certain new and useful Improvements in Dash-Pot Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in dash pot mechanism adaptable for use with valve-gearing or in other connections Where dash pots are employed.

It is well known that the perfect operation of a dash pot when connected with the valve mechanism of an engine will result in economy in the use of steam and a more uniform speed of the engine. When the load on the engine is increased the dash pot plunger will rise in the cylinder and the operation will be fairly eiiicient, but when the load on the engine is decreased the rise of the plunger will be comparatively slight and, on account of the short stroke of said plunger, the operation will be less satisfactory.

The object of my present invention is to afford a more perfect vacuum in the dash pot Cylinder under the plunger to the end of the downward stroke and thereby render more eiicient the operation of the dash pot mechanism, especially when the load on the engine is decreased and the plunger of the dash pot is working with a short stroke in the lower portion of the dash pot cylinder.

Vith this object in view the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

The accompanying drawing illustrates an embodiment of my invention.

While my improvements are adaptable for use in any connection where a dash pot mechanism may be employed, still for the sake of illustration I have shown and will describe the invention as applied to the valve-gear of a Corliss engine.

l represents a dash pot cylinder, the upper portion of which is enlarged and receives the enlarged head 2 of a plunger 3, the latter operating in the lower or smaller portion 4 of said cylinder. With such construction the space under the head 2 of the plunger will constitute a cushion as will be readily understood.

The bottom of the space 5 under the plunger 3 is connected by means of a duct or pipe (3, with one end of a small pump cylinder 7, and in the latter a piston 8 operates.

The dash pot plunger 3 is connected by means of a rod 9 with an arm 10 of a'valve gear, said. arm being secured to the stem 11 of the valve. The valve gear also includes a bell-crank 12 adapted to be connected by means of a suitable rod with the wrist plate of the engine and said bell-crank also carries a hook 13 to coperate with the arm 10 in effecting the operation of the valve. The hook 13 is connected by means of a rod 14 with the pump piston 8, or said pump piston may be connected with the wrist plate of the engine, or in fact with any part of the engine which will furnish the necessary motion for said piston.

From the construction and arrangement of parts above described, it will be seen that when the hook 13 releases the arm 1() the dash pot plunger will drop and the pist-on S of the pump will continue to rise and thereby cause a more perfect vacuum in the bottom of the dash pot cylinder under the plunger 3 to the end of the downward stroke of said plunger and thereby improve the working of the dash pot mechanism where it is most needed. The vacuum pump thus constitutes an accelerator, with the use of which the vacuum in the dash pot will be caused to be strongest when the lift of the dash pot plunger is the least or shortest, due to the continued upward stroke of the accelerator after the dash pot plunger is seated. By this means the working of the dash pot is improved where heretofore it has been Weakest. My improvements produce a more perfect vacuum in the dash pot from the time the plunger starts to rise until it is seated.

, Slight changes might be made in the details of construction of the dash pot mechanism and of the pump as well as the manner of connecting the same with the engine, without departing from the spirit of my invention or limiting its scope, and hence I do not wish to restrict myself to the precise details shown and described.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is,-w

1. The combination with a dash not, of a pump connected with the same below its plunger.

2. The combination with a` dash pot, of a` pump connected with the same below its plunger, und means for operating said pump to withdraw air from under the dash pot plunger when the latter descends.

3. The Combination with an engine, and a dash pot having its plunger connected with a movable part of the engine, of a, pump connected with the dash pot under the plunger thereof, and a` Connection between the piston of said pump and a movable part of the engine, whereby the pump will Operate to withdraw air from under the dash pot plunger simultaneously with the descent of said plunger.

4. The combination with an engine valve gear, and a dash pot, of means connecting the 20 plunger of said dash pot with one member of said Valve gear, a pump connected with the dash pot under the plunger thereof, and a connection between the piston of said pulnp and another member of said valve gear.

ln testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

HENRY F. MYERS. lVitnesses J. R. FRAZIER, ANTON LETZKUS. 

